Gold plating tarnishing?

[LydiaNiz]

Apparently the replacement ring is the same, pitted state so is going back for a refund.

[johnmoto]

Someone sent me photographs today of this ring they purchased - it's apparently gold plated sterling silver (bought from UK), but it arrived like this. The person who made it said it was due to damp air, the purchaser said it was rust-like. I've never had anything plated and don't know the answer - can anyone shed some light on why it may have these spots?
Thanks!
Attachment 8340Attachment 8341

It looks like it's been plated with to much voltage to quickly, that's what you end up with pitting and matted
That's if it is indeed silver.

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